Revert 266798 "[webcrypto] Make operations run on a background t..."

trunk/src/content/child/webcrypto/webcrypto_util.cc

Index: trunk/src/content/child/webcrypto/webcrypto_util.cc
===================================================================
--- trunk/src/content/child/webcrypto/webcrypto_util.cc	(revision 266902)
+++ trunk/src/content/child/webcrypto/webcrypto_util.cc	(working copy)
@@ -22,12 +22,27 @@
   return &data[0];
 }
 
-uint8* Uint8VectorStart(std::vector<uint8>* data) {
-  if (data->empty())
-    return NULL;
-  return &(*data)[0];
+void ShrinkBuffer(blink::WebArrayBuffer* buffer, unsigned int new_size) {
+  DCHECK_LE(new_size, buffer->byteLength());
+
+  if (new_size == buffer->byteLength())
+    return;
+
+  blink::WebArrayBuffer new_buffer = blink::WebArrayBuffer::create(new_size, 1);
+  DCHECK(!new_buffer.isNull());
+  memcpy(new_buffer.data(), buffer->data(), new_size);
+  *buffer = new_buffer;
 }
 
+blink::WebArrayBuffer CreateArrayBuffer(const uint8* data,
+                                        unsigned int data_size) {
+  blink::WebArrayBuffer buffer = blink::WebArrayBuffer::create(data_size, 1);
+  DCHECK(!buffer.isNull());
+  if (data_size)  // data_size == 0 might mean the data pointer is invalid
+    memcpy(buffer.data(), data, data_size);
+  return buffer;
+}
+
 // This function decodes unpadded 'base64url' encoded data, as described in
 // RFC4648 (http://www.ietf.org/rfc/rfc4648.txt) Section 5. To do this, first
 // change the incoming data to 'base64' encoding by applying the appropriate